As shown in the figure, the ball with a mass of 1kg is put on a fixed straight rod, and the rod is pressed at an angle of 30 degrees with the horizontal direction. The dynamic friction factor between the ball and the rod is u = 2 As shown in the figure, a small ball with a mass of M = 1kg is put through a fixed straight rod, and the rod is pressed at an angle of 30 degrees with the horizontal direction. The dynamic friction factor between the ball and the rod is u = one-third of the root of 2, and the vertical upward pull force of the small ball player is f = 20n. Then the acceleration of the small ball sliding along the rod is

G*cos30=FN;F-f-G*sin30=ma; a=12.5m/s^2

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1. As shown in the figure, a small ball with a mass of 1kg passes through a fixed straight rod. The angle between the rod and the horizontal direction is 30 degrees. The dynamic friction coefficient between the ball and the rod is μ = 36. When the ball is subjected to a vertical upward tension f = 20n, what is the acceleration of the ball sliding along the rod? （g=10m/s2）
2. The ball with a mass of 1kg is put on the slash, and the angle between the slash and the horizontal direction is 30 degrees. The dynamic friction factor between the ball and the rod is root 3 / 6. When the ball is subjected to vertical upward F, it accelerates along the rod with an acceleration of 2m / S2 to calculate the vertical upward tension F
3. AB is 1 / 4 circular arc track, radius r = 0.8m, BC is horizontal track, length s = 3M, friction coefficient at BC is u = 1 / 15, there are objects with mass m = 1kg AB is a 1 / 4 circular arc orbit with radius r = 0.8m, BC is a horizontal orbit with length s = 3M, and the friction coefficient at BC is u = 1 / 15. Now an object with mass m = 1kg slides down from point a to point C just stops. How much work does the resistance on the object in AB section of the orbit do?
4. As shown in the figure, the mass of the inclined plane is m, the inclination angle is θ, and the dynamic friction coefficient between the inclined plane and the horizontal plane is μ. A small ball with mass of M is suspended vertically by a string and is still on a smooth inclined plane. When the rope is burned, at least how much horizontal force to the right is used to pull the inclined plane from the rest, so that the ball can freely fall to the ground?
5. The object with mass m = 2kg is still on the horizontal plane, and the dynamic friction coefficient between them is μ = 0.5. Now, the force F, f = 10N, θ = 37 ° as shown in the figure is applied to the object. After t = 10s, the force F is removed, and after a period of time, the object is still again (1) The acceleration of an object when accelerating (2) what is the maximum velocity in the process of the object moving (3) what is the total displacement of the object moving? (g = 10m / S2)
6. It is known that the dynamic friction coefficient between the block and the table is 0.2, and the maximum static friction between the block and the table is 5 N. Two horizontal forces f '= 10N and f' '= 6N are applied on the block (1) Find the size and direction of the friction force on the block (2) If the external force F 'is removed, what is the magnitude and direction of the friction force on the block?
7. A and B objects are stacked on the horizontal table, as shown in the figure. The friction coefficient between B and the table is 0.4, and the mass of the two objects is Ma = 2kg and MB = 3kg respectively. When B is pulled by 30n horizontal force F, AB does not produce relative sliding, so the friction force on a is calculated
8. The mass of AB is 2kg, the dynamic friction coefficient of 4kga and the table top is 0.02. When object B is released gently, the acceleration of object a sliding along the table top is?
9. A uniform thin rod with length L and mass m is placed flat on a horizontal table with friction coefficient M. suppose that the rod rotates around the center o with angular velocity W at the beginning and perpendicular to the axis of the table. Try to find (1) the friction torque used on the rod. (2) how long does it take for the rod to stop rotating
10. The friction coefficient between the object and the table is u. The displacement s caused by pushing the object with force F is to remove F, How far can an object go
11. Put an object with a mass of 1kg on a horizontal plane, use 8N horizontal pulling force to make the object move from rest, the dynamic friction coefficient between the object and the horizontal plane is 0.2, and remove the pulling force when the object moves for 2S. (G is taken as 10m / S2) calculate: (1) the kinetic energy of the object at the end of 2S. (2) the maximum distance that the object can slide forward on the water plane after 2S
12. The dynamic friction coefficient between the object with mass m = 1kg and the horizontal plane is 0.5. Under the action of horizontal tension f = 10N, the object starts to move from static state, and (1) the object passes through 2.5m If the horizontal pulling force is removed when the object passes through 2.5m, how far can the object move
13. Put an object with a mass of 1kg on a horizontal plane, use 8N horizontal pulling force to make the object move from rest, the dynamic friction coefficient between the object and the horizontal plane is 0.2, and remove the pulling force when the object moves for 2S. (G is taken as 10m / S2) calculate: (1) the kinetic energy of the object at the end of 2S. (2) the maximum distance that the object can slide forward on the water plane after 2S
14. When an object with a mass of 1kg is placed on a rough horizontal plane, the dynamic friction factor μ = 0.1 and the horizontal tension f = 10N, the acceleration is calculated
15. The friction coefficient between the object and the horizontal plane is 0.2 The friction coefficient between the object and the horizontal plane is 0.2. What is the velocity of the object at the end of 2S? If f is changed to vertical downward pressure after 2S, how far can the object move?
16. When two forces of 2n and 3N act on an object with a mass of 1kg at the same time, will the acceleration of the object be 0 to 5N
17. The friction force between the object with a mass of 1kg and the horizontal plane is 5N. Under the action of 10N horizontal force, the object starts to move forward from static state, When the external force is removed after 2 m forward, the object continues to move forward for 1 m. at this time, what is the speed of the object? The object finally stops moving, and its total displacement is?
18. On the horizontal plane, there is a wooden block with a mass of 1kg. Under the action of a force of 5N on the right side of the horizontal plane, 3Q is obtained
19. As shown in the figure, the mass of flat car B is m = 4kg, and the mass of object a on the car is m = 1kg. The dynamic friction coefficient between them is μ = 0.4, and the maximum static friction is F0 = 5N? (2) When f = 26n, what is the friction between a and B? What are the accelerations of a and B at this time?
20. The friction coefficient between AB, B and the ground is 0.25, and the horizontal force of F = 12.5n is used After a period of time, pull out B from under a, g = 10m / S ^ 2. Find out the work done by F and the acceleration of a and B in the process of pulling out the board